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From: Matthew Wilcox <willy@infradead.org>
To: linux-kernel@vger.kernel.org
Cc: minchan@kernel.org, Matthew Wilcox <mawilcox@microsoft.com>,
	akpm@linuxfoundation.org, mpe@ellerman.id.au
Subject: [PATCH v4 2/8] Add testcases for memset16/32/64
Date: Thu, 20 Jul 2017 11:45:33 -0700
Message-ID: <20170720184539.31609-3-willy@infradead.org> (raw)
In-Reply-To: <20170720184539.31609-1-willy@infradead.org>

From: Matthew Wilcox <mawilcox@microsoft.com>

Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
---
 lib/Kconfig  |   3 ++
 lib/string.c | 130 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 133 insertions(+)

diff --git a/lib/Kconfig b/lib/Kconfig
index 6762529ad9e4..40b114a11d7c 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -575,4 +575,7 @@ config PARMAN
 config PRIME_NUMBERS
 	tristate
 
+config STRING_SELFTEST
+	bool "Test string functions"
+
 endmenu
diff --git a/lib/string.c b/lib/string.c
index 198148bb61fd..5af2211c3633 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -1051,3 +1051,133 @@ void fortify_panic(const char *name)
 	BUG();
 }
 EXPORT_SYMBOL(fortify_panic);
+
+#ifdef CONFIG_STRING_SELFTEST
+#include <linux/slab.h>
+#include <linux/module.h>
+
+static __init int memset16_selftest(void)
+{
+	unsigned i, j, k;
+	u16 v, *p = kmalloc(256 * 2 * 2, GFP_KERNEL);
+
+	for (i = 0; i < 256; i++) {
+		for (j = 0; j < 256; j++) {
+			memset(p, 0xa1, 256 * 2 * sizeof(v));
+			memset16(p + i, 0xb1b2, j);
+			for (k = 0; k < 512; k++) {
+				v = p[k];
+				if (k < i) {
+					if (v != 0xa1a1)
+						goto fail;
+				} else if (k < i + j) {
+					if (v != 0xb1b2)
+						goto fail;
+				} else {
+					if (v != 0xa1a1)
+						goto fail;
+				}
+			}
+		}
+	}
+
+fail:
+	kfree(p);
+	if (i < 256)
+		return (i << 24) | (j << 16) | k;
+	return 0;
+}
+
+static __init int memset32_selftest(void)
+{
+	unsigned i, j, k;
+	u32 v, *p = kmalloc(256 * 2 * 4, GFP_KERNEL);
+
+	for (i = 0; i < 256; i++) {
+		for (j = 0; j < 256; j++) {
+			memset(p, 0xa1, 256 * 2 * sizeof(v));
+			memset32(p + i, 0xb1b2b3b4, j);
+			for (k = 0; k < 512; k++) {
+				v = p[k];
+				if (k < i) {
+					if (v != 0xa1a1a1a1)
+						goto fail;
+				} else if (k < i + j) {
+					if (v != 0xb1b2b3b4)
+						goto fail;
+				} else {
+					if (v != 0xa1a1a1a1)
+						goto fail;
+				}
+			}
+		}
+	}
+
+fail:
+	kfree(p);
+	if (i < 256)
+		return (i << 24) | (j << 16) | k;
+	return 0;
+}
+
+static __init int memset64_selftest(void)
+{
+	unsigned i, j, k;
+	u64 v, *p = kmalloc(256 * 2 * 8, GFP_KERNEL);
+
+	for (i = 0; i < 256; i++) {
+		for (j = 0; j < 256; j++) {
+			memset(p, 0xa1, 256 * 2 * sizeof(v));
+			memset64(p + i, 0xb1b2b3b4b5b6b7b8ULL, j);
+			for (k = 0; k < 512; k++) {
+				v = p[k];
+				if (k < i) {
+					if (v != 0xa1a1a1a1a1a1a1a1ULL)
+						goto fail;
+				} else if (k < i + j) {
+					if (v != 0xb1b2b3b4b5b6b7b8ULL)
+						goto fail;
+				} else {
+					if (v != 0xa1a1a1a1a1a1a1a1ULL)
+						goto fail;
+				}
+			}
+		}
+	}
+
+fail:
+	kfree(p);
+	if (i < 256)
+		return (i << 24) | (j << 16) | k;
+	return 0;
+	return 0;
+}
+
+static __init int string_selftest_init(void)
+{
+	int test, subtest;
+
+	test = 1;
+	subtest = memset16_selftest();
+	if (subtest)
+		goto fail;
+
+	test = 2;
+	subtest = memset32_selftest();
+	if (subtest)
+		goto fail;
+
+	test = 3;
+	subtest = memset64_selftest();
+	if (subtest)
+		goto fail;
+
+	pr_info("String selftests succeeded\n");
+	return 0;
+fail:
+	pr_crit("String selftest failure %d.%08x\n", test, subtest);
+	return 0;
+}
+
+module_init(string_selftest_init);
+#endif
-- 
2.13.2

  parent reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-07-20 18:45 [PATCH v4 0/8] Multibyte memset variations Matthew Wilcox
2017-07-20 18:45 ` [PATCH v4 1/8] Add multibyte memset functions Matthew Wilcox
2017-07-20 18:45 ` Matthew Wilcox [this message]
2017-07-20 18:45 ` [PATCH v4 3/8] x86: Implement memset16, memset32 & memset64 Matthew Wilcox
2017-07-20 18:45 ` [PATCH v4 4/8] ARM: Implement " Matthew Wilcox
2017-07-20 18:45 ` [PATCH v4 5/8] alpha: Add support for memset16 Matthew Wilcox
2017-07-20 18:45 ` [PATCH v4 6/8] zram: Convert to using memset_l Matthew Wilcox
2017-07-20 18:45 ` [PATCH v4 7/8] sym53c8xx_2: Convert to use memset32 Matthew Wilcox
2017-07-20 18:45 ` [PATCH v4 8/8] vga: Optimise console scrolling Matthew Wilcox
2017-07-25  5:27 ` [PATCH v4 0/8] Multibyte memset variations Michael Ellerman
2017-07-25 13:08   ` Matthew Wilcox

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